Cita APA (7a ed.)
Ridley, J., & Channing, J. (2008). Safety at Work (7th ed.). Elsevier.
Cita Chicago Style (17a ed.)
Ridley, John, y John Channing. Safety at Work. 7th ed. Amsterdam: Elsevier, 2008.
Cita MLA (9a ed.)
Ridley, John, y John Channing. Safety at Work. 7th ed. Elsevier, 2008.
Precaución: Estas citas no son 100% exactas.